ByteStack.cs

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namespace System.Xml;
 
internal sealed class ByteStack
{
    private byte[] _stack;
 
    private readonly int _growthRate;
 
    private int _top;
 
    private int _size;
 
    public ByteStack(int growthRate)
    {
        _growthRate = growthRate;
        _top = 0;
        _stack = new byte[growthRate];
        _size = growthRate;
    }
 
    public void Push(byte data)
    {
        if (_size == _top)
        {
            byte[] array = new byte[_size + _growthRate];
            if (_top > 0)
            {
                Buffer.BlockCopy(_stack, 0, array, 0, _top);
            }
            _stack = array;
            _size += _growthRate;
        }
        _stack[_top++] = data;
    }
 
    public byte Pop()
    {
        if (_top > 0)
        {
            return _stack[--_top];
        }
        return 0;
    }
}